We claim the ornamental design for a sports board holder, as shown and described.
FIG. 1 is a rear perspective view of a sports board holder, showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right-side elevational view thereof;
FIG. 5 is a left-side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is an enlarged, partial front elevational view thereof of a carrying bag of the design, taken along line 8 of FIG. 2;
FIG. 9 is a front perspective view of the carrying bag in a packed configuration, the remainder of the design packed within the bag; and,
FIG. 10 is a rear perspective view of FIG. 9.
The broken lines showing a person and a skateboard in FIG. 1 depict environmental matter which forms no part of the claimed design. The broken lines showing side seams in FIGS. 4 and 5 illustrate portions of the sports board holder that form no part of the claimed design. The remaining broken lines represent stitching and form part of the claimed design.